Primatologists will sometimes send a macaque warning signal called the open-mouth threat. Basically, form an "O" with your mouth, lean toward them with your body and head, and raise your eyebrows.
Now, I'd love to visit that part of the world. I've always been fascinated with places like India, Thailand, Cambodia, Taiwan, Vietnam...the far East...but it is beginning to make the list with Australia and the ocean in general (swimming in it at any rate): Places I Will Probably Never Go Because There's Too Much Wildlife. In Australia everything is poisonous and you'll be attacked by monkeys in India...go figure.
that is all.